Diodes Incorporated B240S1F-7

Overview

B240S1F from Diodes Incorporated is a 2.0A, 40V Schottky barrier rectifier in SOD123F package, featuring 0.5V max forward voltage at 2A and 0.2mA max reverse leakage at 40V/25°C. It serves as a low-loss power conversion diode in DC-DC boost stages, reverse polarity protection circuits, and freewheeling paths in switching regulators.

For engineers reviewing the B240S1F datasheet, B240S1F pinout, B240S1F application, or B240S1F equivalent, key selection criteria include its thermal stability up to +150°C, 50A non-repetitive surge rating, RoHS-compliant matte tin terminals, and validated performance in high-temperature rectification where low VF and controlled IR are critical.

Technical Context

This Schottky rectifier uses a planar epitaxial construction with low-resistance metal-semiconductor junction to achieve minimal conduction loss. Its 0.45V typical VF at 2A/25°C and 0.40V at 2A/125°C directly reduce power dissipation in compact power supplies.

Reverse leakage remains tightly bounded-0.02mA at 25°C and 12.6mA at 125°C under 40V bias-enabling stable operation in thermally constrained environments such as automotive engine control units and industrial motor drives.

Key Specifications

Pinout & Package

SOD123F surface-mount package: 2-terminal, cathode-banded, molded plastic case (UL 94V-0), 0.015g mass, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Schottky rectifier applications.

Compared with SS24 and MBR240, B240S1F delivers the lowest VF (0.5V max) and best thermal resistance (100°C/W) in the SOD123F footprint-critical for high-efficiency, high-temperature, and space-constrained rectification where leakage and conduction loss must both be minimized.

Availability

B240S1F is available at Aetrix Electronics and suitable for boost converters, reverse polarity protection circuits, freewheeling paths in motor drivers, and OR-ing configurations requiring stable component supply across automotive, industrial, and consumer electronics programs.

Supply support for B240S1F includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management and signal integrity solutions for industrial, automotive, and computing markets.

The B240S1F belongs to Diodes' Schottky rectifier product line, engineered specifically for high-efficiency, high-temperature rectification in compact power supplies and protection circuits where low VF and controlled IR are design-critical.

FAQ

What is the maximum junction temperature for continuous operation of B240S1F?

The B240S1F is rated for continuous operation from −55°C to +150°C junction temperature. Derating begins above +25°C ambient per Figure 4: at +100°C ambient, maximum DC forward current drops to ~1.2A on standard FR-4 PCB. Thermal design must maintain TJ ≤150°C under worst-case load and ambient conditions.

Does B240S1F have a specified junction capacitance value?

Yes. Typical junction capacitance CT is 100 pF at VR = 4.0V and f = 1 MHz (per page 3 of DS39286 Rev. 2–2). This value supports high-frequency switching applications up to ~10 MHz, though actual circuit capacitance depends on PCB layout and bias voltage.

Is B240S1F suitable for automotive under-hood applications?

Yes. Its −55°C to +150°C operating range, 12.6mA IR max at 125°C, and AEC-Q200-untested (but qualification-grade process) construction make it suitable for non-safety-critical under-hood use-e.g., body control modules and HVAC actuators-provided system-level validation confirms reliability under vibration and thermal cycling.

How does the SOD123F package differ from standard SOD123?

SOD123F has tighter dimensional tolerances (e.g., He = 3.30–3.70 mm vs. SOD123's 3.50–4.10 mm) and optimized leadframe geometry for improved solder joint reliability and coplanarity. The "F" suffix denotes Diodes Incorporated's enhanced variant, fully compatible with standard SOD123 footprints but offering better manufacturability in high-volume SMT lines.